Patent GB-696714-A (GB)
Title: Machine for tying up packages
IPC: B65B13/18
Filed: 1951-06-08
Abstract: 696,714. Twisting wires together. AKT.- GES FUR TECHNISCHE NEUHEITEN. June 8, 1951 [July 5, 1950], No. 13649/51. Class 83 (iv). [Also in Group I] A portable machine for tensioning a wire band which is placed by hand round a package, twisting together the wire ends and then cutting off the surplus wire, has a base a which is placed on the package. The ends 14, 15 of the band are passed through clamps 16 on tensioning levers 12, 13, pivoted at 12<SP>1</SP>, 13<SP>1</SP> to the base, and then through guides 30. A constantly running motor-driven worm 1 on the base rotates a wheel 2, and to start a cycle a hollow shaft 4 is pushed to the left in Fig. 1 by means of a knob 5, thereby bringing a dog 6 on the shaft into the path of a dog 3 on the rotating wheel 2. The shaft 4 is thereupon rotated, causing cams 9, 10 thereon to oscillate the levers 12, 13 in opposite directions to tension the wire band, and when shaft 4 has completed half a revolution the dog 6 engages one of two diametricallyopposed dogs 18 on a pinion 19, rotating this pinion and driving a twister pinion 20 to twist together the overlapping wire ends. After half a revolution of pinion 19, a dog 21 on shaft 4 engages a stationary cam 22, the shaft then being moved to the right to disengage dogs 6, 18, but leaving the longer dog 3 in engagement with dog 6. The continued rotation of shaft 4 causes projections 27 on cams 9, 10, to engage shear-blades 28 which are oscillated to shear the free ends of the wire lying in the guides 30, thus leaving the package secured by the band with the ends twisted together. The cam 22 then pushes shaft 4 further to the right to disengage dogs 3, 6, whereupon the shaft comes to rest in the position shown in Fig. 1, and the wheel 19 is locked by a spring detent. A spring 11 returns levers 12, 13 to the pretensioned position when allowed by the cams 9, 10. In a modification, the tensioning and cutting-off cams 57, Fig. 12, are secured to a solid shaft 51 rotatable through reduction gearing 48 from an electric motor 47. From the position of rest as shown, manual starting of the motor causes the shaft 51 to rotate, whereupon the cams 57 oscillate the tensioning levers 57<SP>1</SP> and a disc 66 on the shaft allows a detent 65 to ride off a stationary abutment 64. When the shaft has made half a revolution, the detent 65 comes opposite a spring-pressed pin 62 in the gear 58 engaging the twisting pinion 60, allowing the pin to displace the detent and enter its bush 70, thus coupling the gear 58 to the shaft and rotating the twisting pinion. After another half revolution of shaft 51, the detent 65 engages an inclined surface on the abutment 64 to push the pin 62 within the gear 58, the latter then remaining stationary. As the detent 65 comes into full engagement with the abutment 64, a cam 54 on shaft 51 operates a switch 55 to stop the motor 47. The wheel 58 is again retained in the starting position shown by a spring detent, and on the next cycle of operations, the detent 65 couples the drive to the wheel by means of pin 61, which then occupies the position shown of pin 62. In a modification of the form shown in Fig. 12, the disc 66 secured to shaft 51 carries a spring pin 72, Fig. 13, so that after half a revolution from the position of rest shown (during which the band is tensioned), the pin is cammed by the abutment 64 into a bush 71 in gear 58, coupling the gear to the shaft for the twisting operation, and after another half revolution the abutment disengages the drive. The cam 54 may disconnect the drive by operating a clutch for the driving pinion 50 of shaft 51.